Lamellar microstructure and dynamic behavior of diblock copolymer/nanoparticle composites under electric fields

Soft Matter ◽  
2010 ◽  
Vol 6 (23) ◽  
pp. 5956 ◽  
Author(s):  
Li-Tang Yan ◽  
Heiko G. Schoberth ◽  
Alexander Böker
Keyword(s):  
Dynamic Behavior ◽  
Electric Fields ◽  
Diblock Copolymer ◽  
Lamellar Microstructure ◽  
Nanoparticle Composites

SCFT Study of Diblock Copolymer Melts in Electric Fields: Selective Stabilization of OrthorhombicFdddNetwork Phase

2018 ◽  
Vol 51 (9) ◽  
pp. 3369-3378 ◽  
Author(s):  
Jonathan M. Martin ◽  
Wei Li ◽  
Kris T. Delaney ◽  
Glenn H. Fredrickson
Keyword(s):  
Electric Fields ◽  
Diblock Copolymer ◽  
Selective Stabilization ◽  
Copolymer Melts

Local Control of Microdomain Orientation in Diblock Copolymer Thin Films with Electric Fields

Science ◽  
1996 ◽  
Vol 273 (5277) ◽  
pp. 931-933 ◽  
Author(s):  
T. L. Morkved ◽  
M. Lu ◽  
A. M. Urbas ◽  
E. E. Ehrichs ◽  
H. M. Jaeger ◽  
...  
Keyword(s):  
Thin Films ◽  
Electric Fields ◽  
Local Control ◽  
Diblock Copolymer

On the dynamic behavior of piezoelectric active repair by the boundary element method

2011 ◽  
Vol 22 (18) ◽  
pp. 2137-2146 ◽  
Author(s):  
A. Alaimo ◽  
A. Milazzo ◽  
C. Orlando
Keyword(s):  
Fracture Mechanics ◽  
Boundary Element ◽  
Dynamic Behavior ◽  
Electric Fields ◽  
Dynamic Stress ◽  
Bonding Layer ◽  
Dynamic Stress Intensity Factors ◽  
Tangential Stiffness ◽  
Elastic Interface ◽  
Cracked Structures

The dynamic behavior of piezoelectric active repair bonded on cracked structures is analyzed in this article. The boundary element code used to perform the simulations is implemented in the framework of piezoelectricity in order to model the coupling between the elastic and the electric fields, which represents the most important feature of piezoelectric media. The fracture mechanics problem, i.e. the crack, as well as the bonding layer between the host structure and the active patch is modeled by means of the multidomain technique provided with an interface spring model. More particularly, the spring interface model allows considering the bonding layer as a zero-thickness elastic ply characterized by normal and tangential stiffness constants. The crack is also modeled as an elastic interface characterized by vanishing stiffness. The dual reciprocity method (DRM) has been used in the present time-dependent application for the approximation of the domain inertia terms. Numerical analyses have been carried out in order to characterize the dynamic repairing mechanism of the assembled structure by means of the computation of the dynamic stress intensity factors and discussions are presented to highlight the effect of the inertial forces on the fracture mechanics behavior of the overall assembled structure.

Electric Field Induced Control of Thin Film Diblock Copolymer Domain Orientation

1996 ◽  
Vol 461 ◽  
Author(s):  
T. L. Morkved ◽  
W. A. Lopes ◽  
M. Lu ◽  
A. M. Urbas ◽  
H. M. Jaeger ◽  
...  
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Electric Fields ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Quantitative Measure ◽  
Domain Orientation ◽  
External Electric Fields ◽  
Silicon Nitride Membrane ◽  
Field Lines

ABSTRACTLocal control of domain orientation in diblock copolymer thin films is demonstrated through the use of external electric fields. Thin films of a polystyrene-polymethylmethacrylate diblock copolymers, denoted P(S-b-MMA), were spin coated onto silicon nitride membrane substrates with prefabricated in-plane electrodes, forming cylindrical PMMA microdomains. Films annealed under an applied electric field (E ≤ 37V/μm) at 250°C for 24h under an argon atmosphere showed an alignment of the cylindrical microdomains parallel to the electric field lines. A quantitative measure of the degree of alignment was obtained by correlating the local field strength, E, and direction with the observed cylinder orientation. The alignment was found to saturate above E≈30V/μm, and to decrease rapidly as E falls below this value.

Modeling Self-Assembly of Diblock Copolymer−Nanoparticle Composites

2008 ◽  
Vol 41 (22) ◽  
pp. 8932-8937 ◽  
Author(s):  
Fábio D. A. Aarão Reis
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Nanoparticle Composites

scholarly journals Neutron Spin−Echo Study of the Dynamic Behavior of Amphiphilic Diblock Copolymer Micelles in Aqueous Solution

Langmuir ◽  
2000 ◽  
Vol 16 (24) ◽  
pp. 9177-9185 ◽  
Author(s):  
Hideki Matsuoka ◽  
Yusuke Yamamoto ◽  
Minoru Nakano ◽  
Hitoshi Endo ◽  
Hitoshi Yamaoka ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Dynamic Behavior ◽  
Diblock Copolymer ◽  
Spin Echo ◽  
Neutron Spin ◽  
Amphiphilic Diblock Copolymer ◽  
Neutron Spin Echo ◽  
Copolymer Micelles

scholarly journals Dynamic behavior of nematic liquid crystal mixtures with quantum dots in electric fields

2018 ◽  
Vol 9 ◽  
pp. 399-406 ◽  
Author(s):  
Emil Petrescu ◽  
Cristina Cirtoaje ◽  
Octavian Danila
Keyword(s):  
Experimental Data ◽  
Quantum Dots ◽  
Relaxation Time ◽  
Dynamic Behavior ◽  
Electric Fields ◽  
Mass Fraction ◽  
Liquid Crystalline ◽  
Continuum Theory ◽  
Dynamic Measurements ◽  
Elastic Continuum

The dynamic behavior of a mixture consisting of liquid crystalline 4-cyano-4’-pentylbiphenyl (5CB) and CdSe/ZnS quantum dots in electric fields was theoretically studied. The model was based on elastic continuum theory considering the interaction of the nematic molecules with the surrounding molecules, with the quantum dots and with the electric field. Experimental data obtained by dynamic measurements on a sample containing 0.89% (mass fraction) of CdSe/ZnS quantum dots revealed a decrease of the relaxation time compared to pure 5CB.

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